After all these years, and growing up with Windows 3.1, I have seen an entire evolution of computers and software. Touch screens and large resolutions were a pipe dream just 15 years ago. Now it's the norm. Going from a Packard Bell (yes, before HP) that couldn't run 3D Ultra Mini...
Corral the zombies, then shoot them when they're in a big group.
There are jumps in some of the arenas, but it's usually best to keep your wheels on the ground.
Obstacles will flash red if they're about to pop out of the arena floor.